417 lines
15 KiB
LLVM
417 lines
15 KiB
LLVM
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; RUN: opt -S -loop-simplify -loop-fusion -debug-only=loop-fusion -disable-output < %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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@B = common global [1024 x i32] zeroinitializer, align 16
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; CHECK that the two candidates for fusion are placed into separate candidate
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; sets because they are not control flow equivalent.
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; CHECK: Performing Loop Fusion on function non_cfe
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; CHECK: Fusion Candidates:
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; CHECK: *** Fusion Candidate Set ***
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; CHECK: bb
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; CHECK: ****************************
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; CHECK: *** Fusion Candidate Set ***
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; CHECK: bb20.preheader
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; CHECK: ****************************
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; CHECK: Loop Fusion complete
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define void @non_cfe(i32* noalias %arg, i32 %N) {
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bb:
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br label %bb7
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bb7: ; preds = %bb, %bb14
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%.014 = phi i32 [ 0, %bb ], [ %tmp15, %bb14 ]
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%indvars.iv23 = phi i64 [ 0, %bb ], [ %indvars.iv.next3, %bb14 ]
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%tmp = add nsw i32 %.014, -3
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%tmp8 = add nuw nsw i64 %indvars.iv23, 3
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%tmp9 = trunc i64 %tmp8 to i32
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%tmp10 = mul nsw i32 %tmp, %tmp9
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%tmp11 = trunc i64 %indvars.iv23 to i32
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%tmp12 = srem i32 %tmp10, %tmp11
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%tmp13 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv23
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store i32 %tmp12, i32* %tmp13, align 4
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br label %bb14
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bb14: ; preds = %bb7
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%indvars.iv.next3 = add nuw nsw i64 %indvars.iv23, 1
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%tmp15 = add nuw nsw i32 %.014, 1
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%exitcond4 = icmp ne i64 %indvars.iv.next3, 100
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br i1 %exitcond4, label %bb7, label %bb34
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bb34:
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%cmp = icmp slt i32 %N, 50
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br i1 %cmp, label %bb16, label %bb33
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bb16: ; preds = %bb34
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%tmp17 = load i32, i32* %arg, align 4
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%tmp18 = icmp slt i32 %tmp17, 0
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br i1 %tmp18, label %bb20.preheader, label %bb33
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bb20.preheader: ; preds = %bb16
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br label %bb22
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bb22: ; preds = %bb20.preheader, %bb30
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%.02 = phi i32 [ 0, %bb20.preheader ], [ %tmp31, %bb30 ]
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%indvars.iv1 = phi i64 [ 0, %bb20.preheader ], [ %indvars.iv.next, %bb30 ]
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%tmp23 = add nsw i32 %.02, -3
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%tmp24 = add nuw nsw i64 %indvars.iv1, 3
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%tmp25 = trunc i64 %tmp24 to i32
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%tmp26 = mul nsw i32 %tmp23, %tmp25
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%tmp27 = trunc i64 %indvars.iv1 to i32
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%tmp28 = srem i32 %tmp26, %tmp27
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%tmp29 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv1
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store i32 %tmp28, i32* %tmp29, align 4
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br label %bb30
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bb30: ; preds = %bb22
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%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
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%tmp31 = add nuw nsw i32 %.02, 1
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%exitcond = icmp ne i64 %indvars.iv.next, 100
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br i1 %exitcond, label %bb22, label %bb33.loopexit
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bb33.loopexit: ; preds = %bb30
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br label %bb33
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bb33: ; preds = %bb33.loopexit, %bb16, %bb34
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ret void
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}
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; Check that fusion detects the two canddates are not adjacent (the exit block
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; of the first candidate is not the preheader of the second candidate).
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; CHECK: Performing Loop Fusion on function non_adjacent
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; CHECK: Fusion Candidates:
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; CHECK: *** Fusion Candidate Set ***
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; CHECK-NEXT: [[LOOP1PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: [[LOOP2PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: ****************************
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; CHECK: Attempting fusion on Candidate Set:
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; CHECK-NEXT: [[LOOP1PREHEADER]]
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; CHECK-NEXT: [[LOOP2PREHEADER]]
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; CHECK: Fusion candidates are not adjacent. Not fusing.
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; CHECK: Loop Fusion complete
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define void @non_adjacent(i32* noalias %arg) {
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bb:
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br label %bb5
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bb4: ; preds = %bb11
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br label %bb13
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bb5: ; preds = %bb, %bb11
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%.013 = phi i64 [ 0, %bb ], [ %tmp12, %bb11 ]
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%tmp = add nsw i64 %.013, -3
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%tmp6 = add nuw nsw i64 %.013, 3
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%tmp7 = mul nsw i64 %tmp, %tmp6
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%tmp8 = srem i64 %tmp7, %.013
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%tmp9 = trunc i64 %tmp8 to i32
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%tmp10 = getelementptr inbounds i32, i32* %arg, i64 %.013
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store i32 %tmp9, i32* %tmp10, align 4
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br label %bb11
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bb11: ; preds = %bb5
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%tmp12 = add nuw nsw i64 %.013, 1
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%exitcond2 = icmp ne i64 %tmp12, 100
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br i1 %exitcond2, label %bb5, label %bb4
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bb13: ; preds = %bb4
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br label %bb16
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bb15: ; preds = %bb23
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br label %bb25
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bb16: ; preds = %bb13, %bb23
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%.02 = phi i64 [ 0, %bb13 ], [ %tmp24, %bb23 ]
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%tmp17 = add nsw i64 %.02, -3
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%tmp18 = add nuw nsw i64 %.02, 3
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%tmp19 = mul nsw i64 %tmp17, %tmp18
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%tmp20 = srem i64 %tmp19, %.02
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%tmp21 = trunc i64 %tmp20 to i32
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%tmp22 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %.02
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store i32 %tmp21, i32* %tmp22, align 4
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br label %bb23
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bb23: ; preds = %bb16
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%tmp24 = add nuw nsw i64 %.02, 1
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%exitcond = icmp ne i64 %tmp24, 100
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br i1 %exitcond, label %bb16, label %bb15
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bb25: ; preds = %bb15
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ret void
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}
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; Check that the different bounds are detected and prevent fusion.
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; CHECK: Performing Loop Fusion on function different_bounds
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; CHECK: Fusion Candidates:
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; CHECK: *** Fusion Candidate Set ***
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; CHECK-NEXT: [[LOOP1PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: [[LOOP2PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: ****************************
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; CHECK: Attempting fusion on Candidate Set:
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; CHECK-NEXT: [[LOOP1PREHEADER]]
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; CHECK-NEXT: [[LOOP2PREHEADER]]
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; CHECK: Fusion candidates do not have identical trip counts. Not fusing.
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; CHECK: Loop Fusion complete
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define void @different_bounds(i32* noalias %arg) {
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bb:
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br label %bb5
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bb4: ; preds = %bb11
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br label %bb13
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bb5: ; preds = %bb, %bb11
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%.013 = phi i64 [ 0, %bb ], [ %tmp12, %bb11 ]
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%tmp = add nsw i64 %.013, -3
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%tmp6 = add nuw nsw i64 %.013, 3
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%tmp7 = mul nsw i64 %tmp, %tmp6
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%tmp8 = srem i64 %tmp7, %.013
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%tmp9 = trunc i64 %tmp8 to i32
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%tmp10 = getelementptr inbounds i32, i32* %arg, i64 %.013
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store i32 %tmp9, i32* %tmp10, align 4
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br label %bb11
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bb11: ; preds = %bb5
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%tmp12 = add nuw nsw i64 %.013, 1
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%exitcond2 = icmp ne i64 %tmp12, 100
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br i1 %exitcond2, label %bb5, label %bb4
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bb13: ; preds = %bb4
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br label %bb16
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bb15: ; preds = %bb23
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br label %bb25
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bb16: ; preds = %bb13, %bb23
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%.02 = phi i64 [ 0, %bb13 ], [ %tmp24, %bb23 ]
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%tmp17 = add nsw i64 %.02, -3
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%tmp18 = add nuw nsw i64 %.02, 3
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%tmp19 = mul nsw i64 %tmp17, %tmp18
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%tmp20 = srem i64 %tmp19, %.02
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%tmp21 = trunc i64 %tmp20 to i32
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%tmp22 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %.02
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store i32 %tmp21, i32* %tmp22, align 4
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br label %bb23
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bb23: ; preds = %bb16
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%tmp24 = add nuw nsw i64 %.02, 1
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%exitcond = icmp ne i64 %tmp24, 200
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br i1 %exitcond, label %bb16, label %bb15
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bb25: ; preds = %bb15
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ret void
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}
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; Check that the negative dependence between the two candidates is identified
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; and prevents fusion.
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; CHECK: Performing Loop Fusion on function negative_dependence
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; CHECK: Fusion Candidates:
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; CHECK: *** Fusion Candidate Set ***
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; CHECK-NEXT: [[LOOP1PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: [[LOOP2PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: ****************************
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; CHECK: Attempting fusion on Candidate Set:
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; CHECK-NEXT: [[LOOP1PREHEADER]]
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; CHECK-NEXT: [[LOOP2PREHEADER]]
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; CHECK: Memory dependencies do not allow fusion!
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; CHECK: Loop Fusion complete
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define void @negative_dependence(i32* noalias %arg) {
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bb:
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br label %bb7
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bb11.preheader: ; preds = %bb9
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br label %bb13
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bb7: ; preds = %bb, %bb9
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%indvars.iv22 = phi i64 [ 0, %bb ], [ %indvars.iv.next3, %bb9 ]
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%tmp = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv22
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%tmp8 = trunc i64 %indvars.iv22 to i32
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store i32 %tmp8, i32* %tmp, align 4
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br label %bb9
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bb9: ; preds = %bb7
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%indvars.iv.next3 = add nuw nsw i64 %indvars.iv22, 1
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%exitcond4 = icmp ne i64 %indvars.iv.next3, 100
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br i1 %exitcond4, label %bb7, label %bb11.preheader
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bb13: ; preds = %bb11.preheader, %bb18
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%indvars.iv1 = phi i64 [ 0, %bb11.preheader ], [ %indvars.iv.next, %bb18 ]
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%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
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%tmp14 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv.next
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%tmp15 = load i32, i32* %tmp14, align 4
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%tmp16 = shl nsw i32 %tmp15, 1
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%tmp17 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv1
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store i32 %tmp16, i32* %tmp17, align 4
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br label %bb18
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bb18: ; preds = %bb13
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%exitcond = icmp ne i64 %indvars.iv.next, 100
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br i1 %exitcond, label %bb13, label %bb19
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bb19: ; preds = %bb18
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ret void
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}
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; Check for values defined in Loop 0 and used in Loop 1.
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; It is not safe to fuse in this case, because the second loop has
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; a use of %.01.lcssa which is defined in the body of loop 0. The
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; first loop must execute completely in order to compute the correct
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; value of %.01.lcssa to be used in the second loop.
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; CHECK: Performing Loop Fusion on function sumTest
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; CHECK: Fusion Candidates:
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; CHECK: *** Fusion Candidate Set ***
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; CHECK-NEXT: [[LOOP1PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: [[LOOP2PREHEADER:bb[0-9]*]]
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; CHECK-NEXT: ****************************
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; CHECK: Attempting fusion on Candidate Set:
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; CHECK-NEXT: [[LOOP1PREHEADER]]
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; CHECK-NEXT: [[LOOP2PREHEADER]]
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; CHECK: Memory dependencies do not allow fusion!
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; CHECK: Loop Fusion complete
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define i32 @sumTest(i32* noalias %arg) {
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bb:
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br label %bb9
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bb13.preheader: ; preds = %bb9
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br label %bb15
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bb9: ; preds = %bb, %bb9
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%.01.lcssa = phi i32 [ 0, %bb ], [ %tmp11, %bb9 ]
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%.013 = phi i32 [ 0, %bb ], [ %tmp11, %bb9 ]
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%indvars.iv32 = phi i64 [ 0, %bb ], [ %indvars.iv.next4, %bb9 ]
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%tmp = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv32
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%tmp10 = load i32, i32* %tmp, align 4
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%tmp11 = add nsw i32 %.013, %tmp10
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%indvars.iv.next4 = add nuw nsw i64 %indvars.iv32, 1
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%exitcond5 = icmp ne i64 %indvars.iv.next4, 100
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br i1 %exitcond5, label %bb9, label %bb13.preheader
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bb14: ; preds = %bb20
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br label %bb21
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bb15: ; preds = %bb13.preheader, %bb20
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%indvars.iv1 = phi i64 [ 0, %bb13.preheader ], [ %indvars.iv.next, %bb20 ]
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%tmp16 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv1
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%tmp17 = load i32, i32* %tmp16, align 4
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%tmp18 = sdiv i32 %tmp17, %.01.lcssa
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%tmp19 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv1
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store i32 %tmp18, i32* %tmp19, align 4
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br label %bb20
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bb20: ; preds = %bb15
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%indvars.iv.next = add nuw nsw i64 %indvars.iv1, 1
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%exitcond = icmp ne i64 %indvars.iv.next, 100
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br i1 %exitcond, label %bb15, label %bb14
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bb21: ; preds = %bb14
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ret i32 %.01.lcssa
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}
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; Similar to sumTest above. The first loop computes %add and must
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; complete before it is used in the second loop. Thus, these two loops
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; also cannot be fused.
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; CHECK: Performing Loop Fusion on function test
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; CHECK: Fusion Candidates:
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; CHECK: *** Fusion Candidate Set ***
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; CHECK-NEXT: [[LOOP1PREHEADER:for.body[0-9]*.preheader]]
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; CHECK-NEXT: [[LOOP2PREHEADER:for.body[0-9]*.preheader]]
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; CHECK-NEXT: ****************************
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; CHECK: Attempting fusion on Candidate Set:
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; CHECK-NEXT: [[LOOP1PREHEADER]]
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; CHECK-NEXT: [[LOOP2PREHEADER]]
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; CHECK: Memory dependencies do not allow fusion!
|
||
|
|
; CHECK: Loop Fusion complete
|
||
|
|
define float @test(float* nocapture %a, i32 %n) {
|
||
|
|
entry:
|
||
|
|
%conv = zext i32 %n to i64
|
||
|
|
%cmp32 = icmp eq i32 %n, 0
|
||
|
|
br i1 %cmp32, label %for.cond.cleanup7, label %for.body
|
||
|
|
|
||
|
|
for.body: ; preds = %for.body, %entry
|
||
|
|
%i.034 = phi i64 [ %inc, %for.body ], [ 0, %entry ]
|
||
|
|
%sum1.033 = phi float [ %add, %for.body ], [ 0.000000e+00, %entry ]
|
||
|
|
%idxprom = trunc i64 %i.034 to i32
|
||
|
|
%arrayidx = getelementptr inbounds float, float* %a, i32 %idxprom
|
||
|
|
%0 = load float, float* %arrayidx, align 4
|
||
|
|
%add = fadd float %sum1.033, %0
|
||
|
|
%inc = add nuw nsw i64 %i.034, 1
|
||
|
|
%cmp = icmp ult i64 %inc, %conv
|
||
|
|
br i1 %cmp, label %for.body, label %for.body8
|
||
|
|
|
||
|
|
for.body8: ; preds = %for.body, %for.body8
|
||
|
|
%i2.031 = phi i64 [ %inc14, %for.body8 ], [ 0, %for.body ]
|
||
|
|
%idxprom9 = trunc i64 %i2.031 to i32
|
||
|
|
%arrayidx10 = getelementptr inbounds float, float* %a, i32 %idxprom9
|
||
|
|
%1 = load float, float* %arrayidx10, align 4
|
||
|
|
%div = fdiv float %1, %add
|
||
|
|
store float %div, float* %arrayidx10, align 4
|
||
|
|
%inc14 = add nuw nsw i64 %i2.031, 1
|
||
|
|
%cmp5 = icmp ult i64 %inc14, %conv
|
||
|
|
br i1 %cmp5, label %for.body8, label %for.cond.cleanup7
|
||
|
|
|
||
|
|
for.cond.cleanup7: ; preds = %for.body8, %entry
|
||
|
|
%sum1.0.lcssa36 = phi float [ 0.000000e+00, %entry ], [ %add, %for.body8 ]
|
||
|
|
ret float %sum1.0.lcssa36
|
||
|
|
}
|
||
|
|
|
||
|
|
; Check that non-rotated loops are not considered for fusion.
|
||
|
|
; CHECK: Performing Loop Fusion on function notRotated
|
||
|
|
; CHECK: Loop bb{{.*}} is not rotated!
|
||
|
|
; CHECK: Loop bb{{.*}} is not rotated!
|
||
|
|
define void @notRotated(i32* noalias %arg) {
|
||
|
|
bb:
|
||
|
|
br label %bb5
|
||
|
|
|
||
|
|
bb5: ; preds = %bb14, %bb
|
||
|
|
%indvars.iv2 = phi i64 [ %indvars.iv.next3, %bb14 ], [ 0, %bb ]
|
||
|
|
%.01 = phi i32 [ 0, %bb ], [ %tmp15, %bb14 ]
|
||
|
|
%exitcond4 = icmp ne i64 %indvars.iv2, 100
|
||
|
|
br i1 %exitcond4, label %bb7, label %bb17
|
||
|
|
|
||
|
|
bb7: ; preds = %bb5
|
||
|
|
%tmp = add nsw i32 %.01, -3
|
||
|
|
%tmp8 = add nuw nsw i64 %indvars.iv2, 3
|
||
|
|
%tmp9 = trunc i64 %tmp8 to i32
|
||
|
|
%tmp10 = mul nsw i32 %tmp, %tmp9
|
||
|
|
%tmp11 = trunc i64 %indvars.iv2 to i32
|
||
|
|
%tmp12 = srem i32 %tmp10, %tmp11
|
||
|
|
%tmp13 = getelementptr inbounds i32, i32* %arg, i64 %indvars.iv2
|
||
|
|
store i32 %tmp12, i32* %tmp13, align 4
|
||
|
|
br label %bb14
|
||
|
|
|
||
|
|
bb14: ; preds = %bb7
|
||
|
|
%indvars.iv.next3 = add nuw nsw i64 %indvars.iv2, 1
|
||
|
|
%tmp15 = add nuw nsw i32 %.01, 1
|
||
|
|
br label %bb5
|
||
|
|
|
||
|
|
bb17: ; preds = %bb27, %bb5
|
||
|
|
%indvars.iv = phi i64 [ %indvars.iv.next, %bb27 ], [ 0, %bb5 ]
|
||
|
|
%.0 = phi i32 [ 0, %bb5 ], [ %tmp28, %bb27 ]
|
||
|
|
%exitcond = icmp ne i64 %indvars.iv, 100
|
||
|
|
br i1 %exitcond, label %bb19, label %bb18
|
||
|
|
|
||
|
|
bb18: ; preds = %bb17
|
||
|
|
br label %bb29
|
||
|
|
|
||
|
|
bb19: ; preds = %bb17
|
||
|
|
%tmp20 = add nsw i32 %.0, -3
|
||
|
|
%tmp21 = add nuw nsw i64 %indvars.iv, 3
|
||
|
|
%tmp22 = trunc i64 %tmp21 to i32
|
||
|
|
%tmp23 = mul nsw i32 %tmp20, %tmp22
|
||
|
|
%tmp24 = trunc i64 %indvars.iv to i32
|
||
|
|
%tmp25 = srem i32 %tmp23, %tmp24
|
||
|
|
%tmp26 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %indvars.iv
|
||
|
|
store i32 %tmp25, i32* %tmp26, align 4
|
||
|
|
br label %bb27
|
||
|
|
|
||
|
|
bb27: ; preds = %bb19
|
||
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
||
|
|
%tmp28 = add nuw nsw i32 %.0, 1
|
||
|
|
br label %bb17
|
||
|
|
|
||
|
|
bb29: ; preds = %bb18
|
||
|
|
ret void
|
||
|
|
}
|